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Stock-Based Compensation - Summary of the Activity for Market Performance Units Awards (Details) - Market performance shares [Member] - USD ($)
$ / shares in Units, shares in Thousands
6 Months Ended 12 Months Ended
Jul. 31, 2016
Jan. 31, 2016
Units    
Beginning balance (in shares) 220  
Performance units granted (in shares) 0  
Performance units vested (in shares) 0  
Performance units cancelled/forfeited (in shares) 0  
Ending balance (in shares) 220 220
Weighted Average Grant Date Fair Value (per share)    
Beginning balance $ 15.59  
Stock units granted 0  
Performance units vested (in dollars per share) 0  
Performance units forfeited (in dollars per share) 0  
Ending balance $ 15.59 $ 15.59
Aggregate Unrecognized Compensation    
Beginning balance $ 143  
Ending balance $ 0 $ 143
Weighted Average Period Over Which Expected to be Recognized (in years)    
Weighted average period over which expected to be recognized 0 years 1 month